SMT inductance types can be divided into four categories

There are four main types of SMT inductors: winding type, laminated type, braided type and thin-film type. Commonly used is winding and lamination two types. The former is the product of miniaturization of conventional winding inductors. The latter is made by using the multi-layer printing technology and the lamination production process. The volume is smaller than the winding chip inductor, which is the key product in the field of inductance components.

1. The wound

Its characteristic is the inductance quantity range is wide (mH ~ H), the inductance quantity precision is high, the loss is small (namely Q is big), the tolerance current is big, the manufacture craft inheritance is strong, the simplicity, the cost is low, but the deficiency is in the further miniaturization aspect is limited. The inductor with ceramic core can maintain a stable inductance and a high Q value at such a high frequency, so it occupies a position in the high frequency circuit.

TDK NL series inductance is winding, 0.01 ~ 100uH, precision 5%, high Q value, can meet the general requirements.

NLC type is suitable for power supply circuit, rated current up to 300mA; NLV type is high Q value, environmental protection (recycled plastic), can be exchanged with NL; NLFC has magnetic screen, suitable for power cord.

2. Laminated type

It has good magnetic shielding, high sintering density and good mechanical strength. The defects are low pass rate, high cost, small inductance and low Q value.

Compared with winding chip inductors, it has many advantages: small size, conducive to the miniaturization of the circuit, magnetic circuit closure, will not interfere with the surrounding components, will not be interfered by adjacent components, conducive to the high-density installation of components; Integrated structure, high reliability; Good heat resistance and weldability; Neat shape, suitable for automatic surface installation and production.

TDK MLK inductance, small size, good weldability, magnetic screen, high density design, single chip structure, high reliability; MLG has low sensitivity, high frequency ceramic, suitable for high frequency circuit. MLK operating frequency 12GHz, high Q, low sensitivity (1n~22nH)

3. Film type

It has the characteristics of high Q, high precision, high stability and small volume in microwave frequency band. The internal electrode is concentrated at the same level and the magnetic field distribution is concentrated, which can ensure that the device parameters change little after installation and show good frequency characteristics above 100MHz.

4. Weaving type

The characteristic is that the inductance per unit volume at 1MHz is larger, smaller and easier to install on the substrate than other chip inductors. Miniature magnetic element used for power processing.

In the practical application, the application should be selected according to the situation, and the application effect should be considered as well as the material cost.